# Tag Info

## New answers tagged observer

0

I like to think of it this way, say you have a mirror like sphere such as a silicone ball you would find on a bird bath, now you look at the your reflection that's in the middle of the ball (THAT CAN REPRESENT YOUR REFERNCE FRAME) and then you look at the perceived edge/border of the visible side of the reflective surface (THAT CAN REPRESENT THE SPEED OF ...

2

Similar questions have cropped up on this site many times, and the debate surrounding them is usually fractious because people misunderstand each other's use of words like exist. One of the lessons of General Relativity is that any observer has to choose a locally convenient coordinate system that may not be globally convenient. We on Earth (quite sensibly) ...

1

It's a matter of what you mean by "see". Even for a distant observer, it will take a small amount of time for the gravitational redshift effect to become essentially infinite. If your collapsing gas star redshifts to the point where it won't emit a single photon in the age of the universe, it may not have yet technically "redshifted to zero", but it has ...

1

The actual question in this question, is a good physics question. Freely interpreted, it basically asks if SR effects, in particular time-ordering of spacelike separated events, make it difficult or impossible to simulate physics. The answer to that is no. An "external" Simulator (be it a particle physicist or the hypothetical people simulating our ...

2

No, A will not see B moving faster than the speed of light due to time dilation. What you are doing is a "Galilean Transformation" which is really just an approximation for objects moving with a velocity much less than the speed of light. The proper equation for velocity transformations in special relativity is: $$u'= \frac{u+v}{1+\frac{uv}{c^2}}$$ ...

0

No, you are imagining the Newtonian addition of velocities. For parallel velocities, the sum is $\frac {0.9+0.9}{1+0.9\cdot 0.9} \approx 0.9945 \lt 1$

-1

No. It would not be possible. Things get very hot around the edge of a black hole. There is no technology that exists or is likely to exist that could protect a camera. The fact that EM radiation is in fact light and the strength of gravity...lalala. No. It's just not possible.

0

If my knowledge of time dilation is correct, it goes both ways. Time slows down for the object in this situation. But, time does not slow down for an outside observer. Therefore, no, time would be infinite only for the object nearing the black hole. (I might be wrong, if I am, please tell me in the comments)

1

No, not even light can escape a black hole, therefore radio will be unable to broadcast signals back to Earth. (Radio is a form of light)

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